JP2016202937A - Needleless connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a needleless connector with a new structure in which an inlet and an outlet of a medical solution passage are provided on one side and the other side of a housing in a lengthwise direction and the back-flow of blood and the like can be prevented.SOLUTION: In a needleless connector in which a medical solution passage 14 is provided inside a housing 12, an elastic body storage part 54 is provided in the housing 12, a bag-shaped elastic body 70 is disposed in the elastic body storage part 54, the elastic body storage part 54 comprises a support part for supporting an underside of the bag-shaped elastic body 70, and the medical solution passage 14 is formed on the outer peripheral side of the bag-shaped elastic body 70. Thus, the volume of the medical solution passage 14 can be increased by pressing and elastically deforming the bag-shaped elastic body 70 by a male lure 94 inserted through an inlet 16, and the increased volume of the medical solution passage 14 can be decreased by pulling out the male 94 and restoring the elastic deformation of the bag-shaped elastic body 70.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a needleless connector that is used in a liquid flow path such as an infusion route in the medical field and that can connect a male luer provided in a syringe or the like to the liquid flow path.

  In a liquid flow path that performs infusion, blood transfusion, and the like in the medical field, a needleless connector may be used in order to connect and disconnect a syringe, an infusion bag, and the like. As a kind of such needleless connector, an inlet and an outlet for the chemical liquid channel are provided on one side and the other side in the length direction of the housing, and a valve body for switching the chemical liquid channel between the communication state and the cutoff state is provided at the inlet of the chemical liquid channel. The thing of the structure arrange | positioned in is known. In such a needleless connector, the chemical flow path is brought into communication by inserting a male luer from the inlet of the chemical flow path with the catheter inserted into the blood vessel connected to the outlet of the chemical flow path. Can be injected into the catheter from the male luer.

  Specifically, there is a needleless connector having a structure described in JP-T-2008-540045 (Patent Document 1). In the needleless connector described in Patent Document 1, a rod-shaped movable valve element is disposed with respect to the inlet of the chemical liquid flow path, and the chemical liquid flow path is formed by pushing the movable valve body inward with a male luer. It is supposed to be in communication.

  However, in the needleless connector described in Patent Document 1, a rubber spring and a coil spring for energizing the movable valve body outward to keep the chemical liquid flow path in a blocked state are provided inside a small housing. There was a problem that it had to be assembled and the structure was complicated and difficult to manufacture. Moreover, if there are molding burrs, scratches, etc. on the outer surface of the movable valve body or the inner surface of the housing in which it is housed, the movable valve body becomes difficult to operate due to being caught, and switching between the communication state and the cutoff state of the chemical flow path is not possible. There was also a risk of stability.

  In addition, the needleless connector having the above-described conventional structure has a problem that it is difficult to prevent blood from entering (reverse flow) from the blood vessel into the catheter connected to the drug solution flow path when the male luer is extracted. . Since blood coagulation may occur due to the backflow of blood into the drug solution flow path, there is a need for a needleless connector that prevents backflow of blood when a male luer is withdrawn.

  Note that FIG. 1 of JP-T-2002-514475 (Patent Document 2). 30-31 discloses a needleless connector in which an elastic valve body having a slit is provided at the inlet of a chemical liquid flow path and a hollow elastic body that can be expanded and contracted is accommodated in the chemical liquid flow path. In this needleless connector, the hollow elastic body is reduced and deformed by a male luer inserted through the slit of the elastic valve body, and the reduced deformation of the hollow elastic body is restored and eliminated with the extraction of the male luer. And the backflow prevention of the blood at the time of extraction of a male lure is aimed at by decompression | restoration expansion of this hollow elastic body.

  However, FIG. In the needleless connector described in 30 to 31, since the hollow elastic body is assembled with the opening portion facing the outlet side of the chemical liquid flow path, when the male luer is pressed against the hollow elastic body from the inlet side, the hollow elastic body The body swells substantially uniformly over the entire circumference, and the hollow elastic body may be in close contact with the inner peripheral surface of the chemical liquid flow channel over the entire circumference, and the chemical flow channel may be blocked. There is a problem that it is difficult to secure a stable state.

  Moreover, it is necessary to fix the hollow elastic body with the opening directed toward the outlet side of the chemical liquid flow path in the housing, and it is extremely difficult to assemble the hollow elastic body, and the chemical liquid flow path on the outlet side avoids the hollow elastic body. Manufacture becomes more difficult because it must be formed in a bent and complex shape. Furthermore, since the through holes that communicate the inside of the hollow elastic body with the external space must be formed to extend toward the outlet side while avoiding the chemical liquid flow path, it is possible to secure the space for these through holes and chemical liquid flow paths. There was also a problem that formation was more difficult.

Special table 2008-540045 gazette JP 2002-514475 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the inlet and the outlet of the chemical flow path are provided on one side and the other side in the length direction of the housing. It is another object of the present invention to provide a needleless connector having a novel structure that can prevent backflow of blood or the like.

  The first aspect of the present invention, which has been made to solve such a problem, is the needleless connector in which the inlet and the outlet of the chemical liquid channel are provided on one side and the other side in the length direction of the housing. An elastic body accommodating portion is provided at an intermediate portion in the longitudinal direction of the housing, and a bag-like elastic body that opens in a lateral direction perpendicular to the length direction of the housing is disposed in the elastic body accommodating portion. The body containing portion has a support portion for supporting the lower surface of the bag-like elastic body, the chemical liquid flow path is formed on the outer peripheral side of the bag-like elastic body, and the bag is formed by a male luer inserted from the inlet The volume of the chemical liquid flow path is increased by pushing and elastically deforming the cylindrical elastic body, and the elastic deformation of the bag-shaped elastic body is restored and canceled by removing the male luer. The increased volume of the road is now reduced And wherein the needle-less connector you are.

  In the needleless connector according to the present aspect, in the communication state in which the male luer is inserted from the inlet, the bag-like elastic body is maintained in an elastically deformed state so as to be pushed and crushed by the male luer. When the male lure is extracted from such a communication state, the bag-like elastic body is elastically restored and swells, so that the volume of the chemical liquid channel formed on the outer peripheral side of the bag-like elastic body is reduced. This prevents the generation of a negative pressure in the chemical liquid flow path in the needleless connector when the male luer is extracted, and the backflow of blood can be effectively avoided.

  In addition, in the needleless connector of this aspect, the bag-like elastic body is assembled with the housing open in the lateral direction, and the bag-like elastic body is deformed so as to be crushed from the side by the male luer. Therefore, the bag-like elastic body does not swell evenly, and the communication state of the chemical liquid channel formed on the outer peripheral side of the bag-like elastic body can be stably maintained even when the bag-like elastic body is deformed.

  Further, in the needleless connector of this aspect, since the bag-like elastic body opens in the lateral direction of the housing, the chemical liquid channel on the outlet side can be easily formed avoiding the opening portion of the bag-like elastic body. It becomes possible.

  According to a second aspect of the present invention, there is provided a needleless connector according to the first aspect, wherein an open passage is provided for communicating the bag-like interior of the bag-like elastic body with an external space.

  In this aspect, since the air spring inside the bag-like elastic body is eliminated in the open passage, and the bag-like elastic body is further crushed by the male luer, the chemical flow path when the male luer is extracted is removed. By increasing the volume reduction amount, it becomes possible to prevent blood backflow more effectively.

  According to a third aspect of the present invention, there is provided the needleless connector according to the second aspect, wherein the elastic body accommodating portion is formed to open in a lateral direction of the housing. The opening peripheral edge of the bag-like elastic body assembled from the lateral direction is fixed by a lid, and the open passage is formed through the lid.

  In this aspect, the bag-like elastic body can be fitted and assembled from the lateral direction of the housing, and the bag-like elastic body can be easily assembled to the housing while avoiding the chemical liquid flow paths on the inlet side and the outlet side. Moreover, since the open passage is formed in the lid, the open passage can be easily formed avoiding the chemical liquid flow path formed in the housing.

  A fourth aspect of the present invention is the needleless connector according to any one of the first to third aspects, wherein an opening on the inlet side of the chemical liquid channel is formed in the elastic body housing part of the housing. The inlet side wall surface and the outlet side wall surface on which the outlet side opening is formed are opposed to each other, and the bag-like elastic body is elastically pressed against the inlet side wall surface and the outlet side wall surface, The inlet side opening is covered with the bag-like elastic body.

  In this aspect, in a state where the male luer is extracted, the chemical liquid channel formed in the housing can be held in a blocked state by the bag-like elastic body. Further, the bag-like elastic body can be switched from the shut-off state to the communication state without requiring a special switching operation simply by inserting the male luer from the inlet. Therefore, the blocking state and the communication state of the chemical liquid channel can be switched more reliably and easily, and the operation reliability is improved.

  In addition, in this aspect, since the bag-like elastic body is assembled in contact with the inlet side wall surface and the outlet side wall surface of the elastic body accommodating portion, the chemical liquid flow accompanying the insertion / removal of the internal volume of the bag-like elastic body and the male luer The volume change amount of the path can be largely secured with excellent space efficiency, and the effect of preventing blood backflow when the male luer is extracted can be further improved.

  A fifth aspect of the present invention is the needleless connector according to any one of the first to fourth aspects, wherein the bag-like elastic body includes a peripheral wall portion curved in a U shape, and the chemical liquid flow path. It is formed by a pair of flat wall portions positioned on the inlet side and the outlet side, respectively.

  In this aspect, in the bag-like elastic body, it is possible to change the internal volume efficiently by elastically deforming the bag-like elastic body so as to be crushed in the opposing direction of the inlet and outlet by pressing the male luer. In the bag-like elastic body of the present aspect, the chemical liquid is removed in a state where the male luer is removed by sealing the inlet side and the outlet side of the chemical liquid flow path in the elastic body housing part from the inside with a pair of flat wall portions. The flow path may be more stably maintained in the blocking state.

  A sixth aspect of the present invention is the needleless connector according to any one of the first to fifth aspects, wherein an inner surface of the peripheral wall of the elastic body accommodating portion of the housing extends in a length direction of the housing. A communication concave groove is formed.

  In this aspect, by inserting the male luer, even if the bag-like elastic body swells to the outer peripheral side and is pressed against the peripheral wall surface of the elastic body housing part, the communication state of the chemical liquid flow path is stabilized by the communication concave groove. Can be maintained.

  A seventh aspect of the present invention is the needleless connector according to the sixth aspect, wherein the communication concave groove is connected to the outlet side opening on the outlet side wall surface of the elastic body accommodating portion of the housing. A connection groove is formed.

  In this aspect, by inserting the male luer, even if the bag-like elastic body is pressed against the wall surface on the outlet side of the chemical liquid flow path in the elastic body accommodating portion, the communication state of the chemical liquid flow path is caused by the connection concave groove. It can be maintained stably. In particular, by adopting a connection ditch in combination with the aforementioned communication ditch formed on the peripheral wall surface of the elastic body housing part, the liquid solution flows on the outer circumference side of the bag-like elastic body in a state where the male luer is inserted. It is possible to form the path more stably.

  An eighth aspect of the present invention is the needleless connector according to any one of the first to seventh aspects, wherein a valve body is attached to an inlet portion of the chemical liquid flow path in the housing, and the valve A pusher is arranged between the body and the bag-like elastic body, and the male luer inserted from the valve body pushes the bag-like elastic body through the pusher. is there.

  In this aspect, since the bag-like elastic body is pushed by the pusher, for example, even when the male luer is short or the tip of the male luer is thin, the bag-like elastic body is stably pushed by the pusher to be elastically deformed. Can be made.

  In the needleless connector having the structure according to the present invention, the bag-like elastic body which is crushed by the male luer and elastically deformed by insertion of the male luer is elastically restored when the male luer is pulled out. Bulge out. As a result, a positive pressure is generated in the chemical liquid flow path in the connector, and the effect of preventing the backflow of blood or the like is exhibited.

  In addition, since the bag-like elastic body is opened in the lateral direction and assembled to the housing, the inlet and the outlet of the chemical flow path in the housing can be easily formed avoiding the opening portion of the bag-like elastic body. Can do. Further, even when the male luer is inserted, the bag-like elastic body pushed by the male luer is prevented from being pressed all the way against the inner peripheral surface of the elastic body housing portion, and the outer circumference of the bag-like elastic body is prevented. It is possible to stably maintain the communication state of the chemical liquid channel formed on the side.

1 is an overall perspective view of a needleless connector as an embodiment of the present invention. FIG. 2 is a plan view of the needleless connector shown in FIG. 1. FIG. 2 is a bottom view of the needleless connector shown in FIG. 1. IV-IV sectional drawing in FIG. The top view of the lower housing which comprises the housing of the needleless connector shown by FIG. VI-VI sectional drawing in FIG. The perspective view which shows the pusher which comprises the needleless connector shown by FIG. The perspective view which shows the bag-like elastic body of the needleless connector shown by FIG. FIG. 9 is a longitudinal sectional view corresponding to the IX-IX section in FIG. 8. XX sectional drawing in FIG. The longitudinal cross-sectional explanatory drawing which shows the insertion state of the male luer in the needleless connector shown by FIG.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show a needleless connector 10 as an embodiment of the present invention. The needleless connector 10 is formed with a chemical flow path 14 extending in the vertical direction of FIG. An inlet 16 of the chemical liquid flow path 14 is provided on one side of the housing 12 in the length direction, and an outlet 18 of the chemical liquid flow path 14 is provided on the other side. In the following description, the vertical direction means the vertical direction in FIG. 4 in principle.

  More specifically, the housing 12 has a divided structure, and includes a lower housing 20 that is lower in FIG. 4 and an upper housing 22 that is upper in FIG. Each of the upper and lower housings 20 and 22 is, for example, a molded product of a hard synthetic resin material.

  As shown in FIGS. 5 and 6, the lower housing 20 includes a central recess 24 that opens upward. Further, the peripheral wall portion 26 of the central recess 24 is formed with an opening window 28 penetrating inward and outward at one place on the circumference. The opening window 28 is formed with a length of approximately half a circumference in the circumferential direction of the central recess 24, and a step 29 extending over the entire circumference of the opening window 28 is formed on the outer periphery of the opening window 28. A fitting surface 30 is provided. A pair of locking projections 32 and 32 projecting from the fitting surface 30 are formed near both ends in the circumferential direction of the opening window 28. Further, at the end of the step 29 on the opening side of the central recess 24, there is a locking projection 33a for locking the elastic body receiving portion 54 and the bag-like elastic body 70, which will be described later, when they are fitted. It is provided over the entire circumference of the step 29 at a height of. Further, on the back surface (right direction in FIG. 4) of the peripheral edge portion 76 of the bag-like elastic body 70 to be described later, a locking groove 33b is provided at a position and size corresponding to the locking protrusion 33a.

  Further, the lower housing 20 is formed with a lower cylindrical portion 36 that protrudes downward from the bottom wall portion 34 of the central recess 24. A center hole 38 of the lower cylindrical portion 36 opens to the center of the bottom surface 40 of the central recess 24 at the upper end portion, and opens to the outside at the lower end portion. Further, the bottom surface 40 of the central recess 24 is also a bottom surface 40 of an elastic body housing portion 54 to be described later, and the center hole 38 in the bottom surface 40 is used for discharging a chemical solution from the elastic body housing portion 54 (central recess 24). It is an outlet side opening, and the bottom surface 40 is also an outlet side wall surface on which the outlet side opening is formed. In the present embodiment, an outer peripheral cylindrical wall 42 surrounding the lower cylindrical portion 36 is provided. For example, a thread groove is formed on the inner peripheral surface of the outer peripheral cylindrical wall 42 to provide a lock-type lure structure. It is also possible to configure.

  In addition, the peripheral wall portion 26 of the central recess 24 in the lower housing 20, which is also the peripheral wall portion 26 of the elastic body accommodating portion 54 described later, is a communication recess extending continuously over the entire length in the vertical direction on the inner surface 44. A groove 46 is formed. Furthermore, the inner surface (bottom surface 40) of the bottom wall portion 34 of the central recess 24, which is also the bottom surface 40 of the elastic body accommodating portion 54 to be described later, is an opening of a central hole 38 provided in the center on the bottom surface 40. A connection ditch 50 extending radially outward from the portion is formed. And the lower end of the communication ditch | groove 46 is connected to the outer peripheral end of the connection ditch | groove 50, and is mutually connected. A plurality of the communication ditch 46 and the connection ditch 50 may be formed in the circumferential direction of the central recess 24, but in the present embodiment, each one is formed on the side opposite to the opening window 28. Yes.

  An upper housing 22 is superimposed on the lower housing 20 having such a structure from above. The upper housing 22 is fixed to the upper housing 22 so as to cover substantially the entire upper surface of the lower housing 20.

  A fitting protrusion 52 is provided at a substantially central portion of the lower surface of the upper housing 22, and the fitting protrusion 52 fits into the opening of the central recess 24 of the lower housing 20. The upper housing 22 is assembled to the lower housing 20 so as to cover the opening of the central recess 24. The housing 12 is configured by combining the lower housing 20 and the upper housing 22. Further, in the housing 12, the central recess 24 of the lower housing 20 is covered with the upper housing 22, thereby forming an elastic body accommodating portion 54 positioned at an intermediate portion in the length direction. The elastic body accommodating portion 54 is opened in the lateral direction on the outer peripheral surface of the housing 20 through the opening window 28.

  The upper housing 22 is formed with an upper cylindrical portion 56 that protrudes upward at a substantially central portion of the fitting protrusion 52. The central hole 58 of the upper cylindrical portion 56 opens to the center of the ceiling surface 60 of the elastic body housing portion 54 at the lower end portion, and opens to the outside at the upper end portion. Further, the central hole 58 in the ceiling surface 60 of the elastic body accommodating portion 54 is an inlet side opening for allowing the chemical solution to flow into the elastic body accommodating portion 54, and the ceiling surface 60 is further formed with an inlet side opening. It is also the entrance side wall surface. Furthermore, the inlet side wall surface (that is, the ceiling surface 60) is structured to face the outlet side wall surface (that is, the bottom surface 40). In the present embodiment, a thread groove is formed on the outer peripheral surface of the upper cylindrical portion 56, and a lock-type male luer can be attached.

  Further, the upper cylindrical portion 56 of the upper housing 22 is positioned so as to extend in the vertical direction on substantially the same central axis as the lower cylindrical portion 36 of the lower housing 20. An upper end opening portion of the upper cylindrical portion 56 of the upper housing 22 serves as the inlet 16 of the chemical liquid flow path 14, while an lower end opening portion of the lower cylindrical portion 36 of the lower housing 20 corresponds to the chemical flow. The exit 18 of the road 14 is used.

  In addition, an elastic valve element 62 is attached to the opening portion at the upper end of the upper cylindrical portion 56 of the upper housing 22. The elastic valve body 62 has a substantially disc shape made of an elastic material such as rubber or silicone, and a slit 64 extending in the radial direction is formed through the central portion in the thickness direction. The outer peripheral edge portion of the elastic valve body 62 is fixed to the inner peripheral surface of the opening portion at the upper end of the upper cylindrical portion 56, and the slit 64 is elastically held in a close contact state. This is a disk valve that keeps the inlet 16 in a shut-off state during normal operation.

  Furthermore, a block-shaped pusher 66 is accommodated in the upper cylindrical portion 56 of the upper housing 22 with respect to the center hole 58. The pusher 66 has a substantially circular block shape having an outer diameter slightly smaller than the inner diameter of the center hole 58 of the upper cylindrical portion 56, and the elastic valve is located in the center hole 58 of the upper cylindrical portion 56. It is located below the body 62 and has a length extending from near the lower surface of the elastic valve body 62 to near the opening at the lower end of the center hole 58. The pusher 66 is movable in the length direction in the upper cylindrical portion 56, and the lower end portion of the pusher 66 protrudes into the elastic body accommodating portion 54 by the downward movement. ing.

  Further, as shown in FIG. 7, a channel groove 68 is formed on the surface of the pusher 66. The flow path groove 68 extends from the approximate center of the upper surface of the pusher 66 to the outer peripheral edge thereof, opens on the upper surface of the pusher 66 and extends toward the outer peripheral surface, and further opens on the outer peripheral surface of the pusher 66. The outer peripheral surface extends downward and continues to the middle portion in the axial direction. Moreover, the groove width of the flow channel groove 68 is reduced as it goes downward in the axial direction, and the flow channel groove 68 is formed so as to be V-shaped when viewed from the front. Furthermore, the bottom surface of the channel groove 68 is inclined with respect to the axis of the pusher 66, and the depth of the channel groove 68 in the direction perpendicular to the axis is made shallower as it goes downward. In the present embodiment, two channel grooves 68 having the same shape are formed, and the other channel groove 68 is formed in a circumferentially symmetrical position with respect to one channel groove 68. When the pusher 66 moves downward and protrudes into the elastic body accommodating portion 54, the lower end portion of the flow path groove 68 is exposed in the elastic body accommodating portion 54, and the flow path groove 68 becomes the elastic body accommodating portion 54. It is supposed to be in a communication state.

  On the other hand, a bag-like elastic body 70 is assembled in an accommodated state in the elastic body accommodating portion 54 formed in the housing 12. As shown in FIGS. 8 to 10, the bag-like elastic body 70 is made of an elastic material such as rubber or silicone, and has a bag structure having one opening. In particular, in this embodiment, the housing 12 is opened in a lateral direction orthogonal to the length direction of the housing 12 and has an outer peripheral surface shape that substantially corresponds to the inner peripheral surface shape of the elastic body accommodating portion 54 and has a substantially constant thickness as a whole. Is formed. More specifically, a bag structure is formed by the peripheral wall portion 72 curved in a U-shape and a pair of upper and lower flat plate wall portions 74 and 74 having a flat plate shape. Moreover, the opening part to a side has a shape corresponding to the opening window 28 of the elastic body accommodating part 54, and the flange-shaped peripheral part 76 is integrally formed in the opening part.

  The bag-like elastic body 70 is fitted into the elastic body accommodating portion 54 from the lateral direction of the housing 12 through the opening window 28 and assembled in the accommodated state. At this time, the locking protrusions and the concave grooves 33a, b are fitted, and the bag-like elastic body 70 is placed in a predetermined position in the elastic body accommodating portion 54. b has a stopper function that prevents the bag-like elastic body 70 from entering the inside of the elastic body accommodating portion 54 too much. A lid 78 is overlaid on the opening window 28 of the housing 12. The lid 78 has a shape in which a hollow block-like locking piece 79 is provided at the center of the back surface (right direction in FIG. 4) of the curved plate, and covers the entire opening window 28 of the housing 12. The locking piece 79 enters the inside of the bag-like elastic body 70. Further, the latching piece 79 is opened on the bag-like elastic body 70 side, and the inside of the latching piece 79 communicates with an internal space 82 that is a bag-like inside of the bag-like elastic body 70 described later. When the lid 78 is overlaid on the opening window 28 of the housing 12, the locking piece 79 enters the opening of the bag-like elastic body 70, and in this embodiment, a pair of lids 78 is disposed near both ends in the circumferential direction. Locking holes 80, 80 are formed, and the locking protrusions 32, 32 protruding from the housing 12 are locked to the locking holes 80, 80, so that the lid 78 is attached to the housing 12. It is fixed.

  Further, the bag-like elastic body 70 assembled to the housing 12 has a peripheral portion 76 formed in the opening portion thereof from the outer peripheral surface with respect to the fitting surface 30 formed in the peripheral portion of the opening window 28 of the housing 12. They are overlapped and pressed by a lid 78. Thereby, the opening portion of the bag-like elastic body 70 is fluid-tightly fixed to the peripheral portion of the opening window 28 of the housing 12 and is covered with the lid body 78.

  Thus, the chemical liquid flow path 14 is formed in the elastic body accommodating portion 54 of the housing 12 on the outer peripheral side of the bag-like elastic body 70. This chemical flow path 14 includes not only the elastic body accommodating portion 54 but also the center hole 58 of the upper cylindrical portion 56 and the center hole 38 of the lower cylindrical portion 36 that are communicated with the elastic body accommodating portion 54. It consists of

  Further, an inner space 82 that is blocked from the chemical liquid flow path 14 is formed in the bag-like elastic body 70 inside the bag-like elastic body 70 in the elastic body accommodating portion 54 of the housing 12. In addition, an open passage 84 penetrating inward and outward is formed in the central portion of the lid 78, and the internal space 82 of the bag-like elastic body 70 is communicated with the external space through the open passage 84.

  In particular, the bag-like elastic body 70 of the present embodiment is assembled in a state in which the outer peripheral surface thereof is in close contact with the inner peripheral surface of the elastic body accommodating portion 54 over substantially the entire surface. Based on the elasticity of the bag-like elastic body 70 in a state where the atmospheric pressure is exerted on the internal space 82 of the bag-like elastic body 70, the upper and lower flat plate walls 74, 74 of the bag-like elastic body 70 are The elastic body accommodating portion 54 is pressed against the ceiling surface 60 (that is, the inlet side wall surface) and the bottom surface 40 (that is, the outlet side wall surface).

  Thereby, the opening of the central hole 58 (inlet side opening) of the upper cylindrical part 56 provided on the ceiling surface 60 (inlet side wall surface) of the elastic body accommodating part 54 is the upper wall part of the bag-like elastic body 70. The lid 14 is covered with a certain flat wall 74 so that the chemical liquid flow path 14 is held in the blocked state inside the housing 12. In addition, even if the bag-like elastic body 70 is pressed on the inner peripheral wall inner surface 44 (that is, the inner peripheral wall inner surface of the central recess 24) 44 and the bottom surface 40 of the elastic body accommodating portion 54, the communication concave groove 46 and the connection concave groove 50 The communication state of the chemical liquid channel 14 is maintained.

  The needleless connector 10 having the above-described structure is used with an indwelling catheter or the like connected to the proximal end opening of the drug solution flow path 14 as described above. Then, under such a use state, as shown in FIG. 11, a male luer 94 such as a syringe 92 is inserted from above through the inlet 16 of the upper cylindrical portion 56 of the housing 12. As a result, the male luer 94 is inserted through the slit 64 of the elastic valve body 62, and the distal end surface of the male luer 94 is pressed against the upper end surface of the pusher 66 so that the pusher 66 is moved downward. Move.

  As a result, the pushing force of the male luer 94 is exerted on the bag-like elastic body 70 via the pusher 66, and the lower surface of the pusher 66 is a substantially central portion of the flat plate upper wall portion 74 of the bag-like elastic body 70. Pressed against. As a result, the bag-like elastic body 70 is elastically deformed so as to be crushed up and down in the elastic body accommodating portion 54 of the housing 12. In short, by pushing the male luer 94 into the inlet 16 of the upper cylindrical portion 56 of the housing 12, the central hole 58 of the upper cylindrical portion 56 is communicated with the elastic body accommodating portion 54, and the chemical liquid flow path 14 is Communication is established over the entire length from the inlet 16 to the outlet 18. As a result, the inside of the syringe 92 is maintained in communication with the in-vessel indwelling catheter or the like through the medicinal solution flow path 14, and the target medicinal solution or the like can be injected into the blood vessel.

  In addition, due to the elastic deformation of the bag-like elastic body 70 accompanying the insertion of the male luer 94, the internal volume of the bag-like elastic body 70 is reduced, while the chemical liquid channel 14 on the outer peripheral side of the bag-like elastic body 70 is The volume will increase. Therefore, when the male luer 94 is pulled out, the bag-like elastic body 70 is restored to its original shape as shown in FIG. The internal volume of the elastic body 70 increases. Along with this, the volume of the chemical liquid channel 14 formed on the outer peripheral side of the bag-like elastic body 70 is reduced by an amount corresponding to the increase in the internal volume of the bag-like elastic body 70. As a result, a positive pressure (positive pressure) is generated in the chemical liquid flow path 14, and the effect of preventing the backflow of blood or the like is exhibited.

  In particular, the needleless connector 10 having the above-described structure employs the bag-like elastic body 70 that opens to the side, so that the deformation characteristics of the peripheral wall portion are not uniform, and the elasticity of the bag-like elastic body 70 due to the vertical pressing force. A deformation on the circumference is generated without causing the deformation to swell uniformly over the entire circumference. Specifically, when the male luer 94 is connected, the bag-like elastic body 70 is deformed more greatly in the upper wall portion against which the pusher 66 is pressed than in the lower wall portion superimposed on the bottom surface 40 of the central recess 24. Also in the peripheral wall portion, both side wall portions of the intermediate portion between the opening portion and the bottom portion are greatly deformed as compared with the left opening edge portion and the right bottom portion in FIGS. Therefore, in the deformed state of the bag-like elastic body 70, the chemical liquid channel 14 on the outer peripheral side of the bag-like elastic body 70 can be easily maintained in a communication state. In particular, in the present embodiment, since the communication concave groove 46 is formed in the peripheral wall inner surface 44 of the elastic body accommodating portion 54, the communication state of the chemical liquid channel 14 can be maintained more stably. And since the opening peripheral part of the bag-shaped elastic body 70 opened to the side is supported by the housing 12 in a non-deformable manner, the elastic deformation of the bag-shaped elastic body 70 becomes more uneven. It becomes easier to maintain the chemical liquid flow path 14 in the communication state.

  Further, since the bag-like elastic body 70 can be assembled from the lateral direction with respect to the elastic body accommodating portion 54 of the housing 12, the bag-like elastic body 70 is avoided by avoiding the influence on the chemical liquid flow path 14 extending in the vertical direction. Can be easily assembled. Furthermore, the open passage 84 to the external space of the bag-like elastic body 70 can be easily formed in such a manner that it opens to the side of the housing 12, avoiding the chemical flow path 14 extending in the vertical direction. As a result, the entire structure including the chemical liquid flow path 14 can be simplified, and manufacturing can be facilitated.

  Furthermore, in the needleless connector 10 of the present embodiment, the pressing force of the male luer 94 can be applied to the bag-like elastic body 70 via the pusher 66, so the shape and size of the male luer 94 can be increased. Regardless, the shape and size of the contact surface with respect to the bag-like elastic body 70 can be made constant. As a result, the bag-like elastic body 70 can be stably crushed and elastically deformed, the chemical liquid channel 14 can be stably formed, and the intended backflow prevention effect can be obtained more stably. Is possible.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the specific descriptions in the embodiments, and various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It is feasible in the form which added.

  For example, in the above-described embodiment, the internal space 82 formed in the bag-like elastic body 70 is communicated with the outside by the open passage 84, but the internal space 82 may be used as a sealed space without providing the open passage 84. good. Thereby, when the syringe etc. 92 is extracted after the injection of the chemical solution or the like, the restoring force of the bag-like elastic body 70 can be further ensured by the action of the air spring in the internal space 82.

  Moreover, in the said embodiment, although the bag-like elastic body 70 was assembled | attached so that it might closely_contact | adhere to the elastic body accommodating part 54, it is not necessary, for example, the height, width | variety, depth, etc. of the bag-like elastic body 70 are set. It may be made smaller by a predetermined value compared to the elastic body accommodating portion 54. Thereby, the shape of the bag-like elastic body 70 may be an outer shape different from that of the elastic body accommodating portion 54. Further, in the above-described embodiment, before the syringe 92 or the like is inserted into the needleless connector 10, the chemical liquid flow path 14 is closed so that the upper housing 22 and the bag-like elastic body 70 are in close contact with each other. For example, as the shape of the bag-like elastic body 70 is different from that of the elastic body accommodating portion 54, a gap is created between the upper housing 22 and the bag-like elastic body 70, and as a result, the center hole 58 of the upper cylindrical portion 56 You may make it the state which always connects between the communicating concave grooves 46. FIG.

  Furthermore, by changing the size and shape of the bag-like elastic body 70, the cross-sectional area of the chemical liquid channel 14 can be arbitrarily set. Thus, for example, when a high-viscosity chemical solution is injected, a needleless connector with a large cross-sectional area of the chemical solution channel is used, and when a low-viscosity chemical solution is injected, a needleless connector with a small cross-sectional area of the chemical solution channel is used. It is possible to select a needleless connector suitable for the chemical to be injected, such as using a connector.

  Furthermore, in the said embodiment, although the housing 12 was divided | segmented into the upper part and the lower housings 22 and 20, the specific structure is not limited. For example, the upper and lower housings 22 and 20 may be formed as an integrally molded product, or the upper housing member connected to the syringe and the elastic body containing portion 54 are fitted into the bag-like elastic body 70. You may employ | adopt the housing structure of 3 division | segmentation in the housing middle member and the housing lower member connected to a catheter etc., or 3 division | segmentation or more.

  In addition, the shape of the slit 64 is not limited, and in the above-described embodiment, one piece is formed in the radial direction in the central portion of the elastic valve body 62, but the function of communication or blocking of the chemical liquid flow path 14 is impaired. A shape in which a plurality of slits are formed in a radial manner is possible in a range that does not exist.

  Furthermore, although the pusher 66 is used in the above-described embodiment, the pusher 66 is not necessarily provided, and the front end surface of the male luer 94 is directly pressed against the bag-like elastic body 70 to elasticize the bag-like elastic body 70. You may make it deform | transform. Also, when the pusher is provided, the outer shape, the shape of the groove, and the like are not limited as long as the function of communicating the chemical channel 14 is exhibited. For example, in the above-described embodiment, the two flow channel grooves 68 and 68 are formed on the pusher 66, but may be one or plural. Further, a plurality of flow channel grooves may be communicated with each other. As for the shape of the channel groove, the groove width may be constant or the bottom surface does not need to be inclined with respect to the axis.

10: Needleless connector, 12: Housing, 14: Chemical liquid flow path, 16: Inlet, 18: Outlet, 38: Center hole (outlet side opening), 40: Bottom surface (outlet side wall surface), 44: Inner surface, 46: Communication concave groove, 50: connection concave groove, 54: elastic body accommodating portion, 58: center hole (inlet side opening), 60: ceiling surface (inlet side wall surface), 62: elastic valve body, 64: slit, 66: Pusher, 70: bag-like elastic body, 72: peripheral wall portion, 74: flat plate-like wall portion, 76: peripheral edge portion, 78: lid body, 82: internal space (bag-like inside), 84: open passage, 94: Male lure

Claims (8)

In the needleless connector in which the inlet and outlet of the chemical flow path are provided on one side and the other side in the length direction of the housing,
While an elastic body accommodating portion is provided in an intermediate portion in the length direction of the housing, and a bag-like elastic body that opens in a lateral direction perpendicular to the length direction of the housing is disposed in the elastic body accommodating portion, A male luer which has a support portion for supporting the lower surface of the bag-like elastic body in the elastic body containing portion, and the chemical liquid channel is formed on the outer peripheral side of the bag-like elastic body, and is inserted from the inlet When the bag-like elastic body is pushed and elastically deformed, the volume of the chemical liquid flow path is increased, and the male luer is pulled out and elastic deformation of the bag-like elastic body is restored and eliminated. A needleless connector characterized in that the increased volume of the chemical liquid flow path is reduced.   The needleless connector according to claim 1, wherein an open passage is provided for communicating the bag-shaped interior of the bag-shaped elastic body with an external space.   The elastic body accommodating portion is formed to open in the lateral direction of the housing, and the opening peripheral edge of the bag-like elastic body assembled from the lateral direction with respect to the elastic body accommodating portion is fixed by a lid. The needleless connector according to claim 2, wherein the open passage is formed through the lid. In the elastic body accommodating portion of the housing, the inlet side wall surface in which the inlet side opening of the chemical liquid flow path is formed and the outlet side wall surface in which the outlet side opening is formed are opposed to each other.
The bag-like elastic body is elastically pressed against the inlet side wall surface and the outlet side wall surface, and the inlet side opening is covered with the bag-like elastic body. The needleless connector according to Item.   The bag-like elastic body is formed by a peripheral wall portion curved in a U-shape, and a pair of flat plate-like wall portions positioned respectively on the inlet side and the outlet side of the chemical liquid flow path. 5. The needleless connector according to any one of 4 above.   The needleless connector according to any one of claims 1 to 5, wherein a communication concave groove extending in a length direction of the housing is formed on an inner surface of the peripheral wall in the elastic body housing portion of the housing.   The needleless connector according to claim 6, wherein a connection concave groove that connects the communication concave groove to the outlet-side opening is formed in the outlet side wall surface of the elastic body accommodating portion of the housing.   A valve body is attached to an inlet portion of the chemical liquid flow path in the housing, and a pusher is disposed between the valve body and the bag-like elastic body, and is inserted from the valve body. The needleless connector according to any one of claims 1 to 7, wherein a male luer pushes the bag-like elastic body through the pusher.

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